Device for ascertaining the energy spent during rowing



0a. 2s, 1990.'L M. STUMP E-r AL 1,779,992

DEVICE FOR ASCERTAINING THE ENERGY SPENT DURING ROWING Filed Feb. 28, 1928 2 Sheets-Sheet l Oct. 28, 1930. M. sTUMP ET AL DEVICE FOR ASCERTAINING THE ENERGY SPENT DURING ROWING Filed Feb. 28a l928 v2 sheets-sheet 2 Warn? Patented `Oct.r 28,." 1930r y UNirEDfSTATi-"Es TENT- oFFIcE" MATTHUS STUMP, OF MANNHEIM, AND KURT REYHER, OF'HEIDELBERG, GERMANY IDEYICEgFOR ASCERT'AINING THE ENERGY SPENT DURING ROWING- rApplication. filed February 28, 1928, Serial No. 257,697, and in Germany March 23, 1927i This invention relates to a device permitting ascertaining and recording automatically the energy which an `oarsman spends while he is rowing. We are aware of the fact that which is attached to the oar staff. The use of long transmission members as with the devices employed hitherto gives rise to faulty records; this is obviated with the present improved construction.

Our invention is illustrateddiagrammatij cally and by way of example on the accompanying drawings, on which Figure 1`is a diagrammatic plan of the entire arrangement and combination of parts constituting our improved device; Figure 2 is a diagrammatic side view of that arrangement and combination of partsthe actual position of the axis of the drumV (l1) relatively to the cord (8) actuating the writing lever v1() being, however, left out of consideration; Figure 3 is view similar to Fig. l, but showing the parts drawn to an enlarged scale, and Figure 4 is an end-view of the device showing it seen iny the direction from the righthand end of Fig. 3 to the lefthandy end thereof. j

On the drawings, 1 denotes the oar staff to which are attached clamps 2 and 8 by means of screw-threaded spindles 19. Each clamp has a lateral projection 18, and the two projections 18 are connected with one another by a flat ledge 14, to which they are pivotally connected, and from the middle portion ofwhich` projects laterally forth a pin 17*A supporting a record drum 11. Between this drum and the ledge 14 a disk 15 is also firmly connected `with the middle portion of the ledge 14, and from the lower portion of the disk project laterally forth two brackets 16 serving as bearings for a pin` 2O supporting arm 4, these two arms being'rmly connected with the brackets 3'and 2. The connection kbetween the arms 4, 5 with the wire 6 is effected by means of one or two threaded pins 7a, and nuts 7 thatare adjustable on the pins, thewire ends'being connected with the pins, these latter being supported in the arms 4 and 5,v and each pin bearing two nuts 7, the one von the one side of the appertaining arm and the other nut on the other side of the respective arm.k It is obvious that the wire 6 can be put under tension by these means and that the tension can be regulated.

The small roll 9 is firmly connected with a lever or arm 10 which is subjected to the pull of a helical tension spring 13 tending continually to counteract the pull of the cord 8, or of this cord and the wire 6 together respectively. 'At the free end of the arm 10 is a writing member 10aj and the drum 11 is covered with a suitably ruled sheet of paper on which the writing member writes the record.

connected in said slot with a roll 12fto which' is 4attached one end of a cord 12, the other endl of which is affixed to a suitably located point of the boat. This combination and arrangement yof the several parts renders it possible to obtain either closed orc'ontlinuous records on the drum when lthey boat is driven by the oars. The manner of operation is as follows :V

Vhenv the oar bearing the device is pulled, its staff is bent through more or less according to the amount of force spent (see the dotted lines in the uppermost part of Fig. 2), and owing thereto also the position of the arms 2' andB relatively to each other will change (Fig. 2) ,this is true, obviously,=also of the wires 6 and 8,'as well as of the writing member 10a withrespect tothe drum 11,as thek member 10a is subjected to the action Vof they wire18`, as well as to theaction rofthe s ring 13. There is, thus, a record made on t e drum 11 while the oar is actuated in the known manner. To fully understand the operation it must be borne in mind that the drum is rotated by the intermediary of the cord 12, and it is a matter of course that the drum is combined with a spring which is put under tension when the drum is moved off the point where the cord l2 is affixed to the boat, this spring turning the drumv in the other direction when the drum is moved by and with the oar in the direction to said point.

The ordinatesfof the diagrams indicate the energy s ent, and the absciss indicate the length o time dering which that energy had been spent. The curve indicates the distribution of the energy over that time and constitutes a characteristicv of the performance.

Differences in the elasticity of the oar staii` are compensated by changin corresponding- 1y the tension of the wire 6 .y means of the nut 7 We wish it to be, understood that the change ofthe distance between the points 4 and 5 can be transmitted to the writing member or lever 10 also. by other means than those shown in the drawing merely by way of` example. The points 4 and 5. can be arranged in the tensile zone as well as in the compressive zone of the` oar. f

When the cord 12. is used the drum 11 i rotated alternately in the one and the other direction, but it isl also possible to turn the drum continuously in only one direct-ion in which. case a wheel-work for it is provided.

It is obvious that also other recording means may be made use of. If the drum is turned continuously there are produced continuous diagrams which can be read in the same manner as those obtained with the arrangement andcombination of parts shown in the draw- We claim: y 1.A A devieefor ascertaining the energy 1 ent duringrowingeomprising, incombination. with the oar, arms projecting forth from the stati' of the oar in a, certain distance from each. other;vr a recording drum, and means adapted to transmit the changes of the distance, between the free ends of said arms; to Saiddrum so as to obtain a record. of them. 2. A device for ascertainingA the energy spent during rowing, comprising, in combina` tion withthe oar, arms projecting forth from the staff. 0f the oar in a certain distance from club. other, a recording drum and a writing member ctx-operating with-it, a wire stretched Ont between thefreeends of said arms,l and meals forv transmitting the changes of the tension. of said kwire to. saidwritimg member.

3. A dexice for ascertaining the energy spent during rowing,reomprising, in combination with the oar, arms projecting forth from the stati of tlievoar in acertain-dstance from.

. ezwhother,y arecordingdmnm and awriting member co-operating with it, a wire stretched out between the free ends of said arms, a roll connected with said writing member, another wire connecting said roll with the firstmentioned Wire and adapted to transmit .m 

